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</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../language.html" title="cpp/language">C++ 语言</a></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="expressions.html" title="cpp/language/expressions"> 表达式</a><div class="t-navbar-menu"><div><div style="display:inline-block">
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<tr class="t-nv-h2"><td colspan="5"> 概述 </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="value_category.html" title="cpp/language/value category"> 值类别</a>（左值 lvalue、右值 rvalue、亡值 xvalue）</td></tr>
<tr class="t-nv"><td colspan="5"> <a href="eval_order.html" title="cpp/language/eval order"> 求值顺序</a>（序列点）</td></tr>
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<tr class="t-nv"><td colspan="5"> <a href="expressions.html#.E4.B8.8D.E6.B1.82.E5.80.BC.E8.A1.A8.E8.BE.BE.E5.BC.8F" title="cpp/language/expressions"> 不求值表达式</a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="expressions.html#.E5.88.9D.E7.AD.89.E8.A1.A8.E8.BE.BE.E5.BC.8F" title="cpp/language/expressions"> 初等表达式</a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="lambda.html" title="cpp/language/lambda">lambda 表达式</a><span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 字面量 </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="integer_literal.html" title="cpp/language/integer literal">整数字面量</a></td></tr>
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<tr class="t-nv"><td colspan="5"> <a href="character_literal.html" title="cpp/language/character literal">字符字面量</a>，包含<a href="escape.html" title="cpp/language/escape">转义序列</a></td></tr>
<tr class="t-nv"><td colspan="5"> <strong class="selflink">字符串字面量</strong></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="nullptr.html" title="cpp/language/nullptr">空指针字面量</a><span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="user_literal.html" title="cpp/language/user literal">用户定义字面量</a><span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 运算符 </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="operator_assignment.html" title="cpp/language/operator assignment"> 赋值运算符</a>:
<code>a=b</code>, <code>a+=b</code>, <code>a-=b</code>, <code>a*=b</code>, <code>a/=b</code>, <code>a%=b</code>, <code>a&amp;=b</code>, <code>a|=b</code>, <code>a^=b</code>, <code>a&lt;&lt;=b</code>, <code>a&gt;&gt;=b</code></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="operator_incdec.html" title="cpp/language/operator incdec"> 自增与自减</a>: <code>++a</code>, <code>--a</code>, <code>a++</code>, <code>a--</code></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="operator_arithmetic.html" title="cpp/language/operator arithmetic"> 算术运算符</a>:
<code>+a</code>, <code>-a</code>, <code>a+b</code>, <code>a-b</code>, <code>a*b</code>, <code>a/b</code>, <code>a%b</code>, <code>~a</code>, <code>a&amp;b</code>, <code>a|b</code>, <code>a^b</code>, <code>a&lt;&lt;b</code>, <code>a&gt;&gt;b</code> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="operator_logical.html" title="cpp/language/operator logical"> 逻辑运算符</a>: <code>a||b</code>, <code>a&amp;&amp;b</code>, <code>!a</code></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="operator_comparison.html" title="cpp/language/operator comparison"> 比较运算符</a>: <code>a==b</code>, <code>a!=b</code>, <code>a&lt;b</code>, <code>a&gt;b</code>, <code>a&lt;=b</code>, <code>a&gt;=b</code>, <code>a&lt;=&gt;b</code><span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="operator_member_access.html" title="cpp/language/operator member access"> 成员访问运算符</a>: <code>a[b]</code>, <code>*a</code>, <code>&amp;a</code>, <code>a-&gt;b</code>, <code>a.b</code>, <code>a-&gt;*b</code>, <code>a.*b</code></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="operator_other.html" title="cpp/language/operator other"> 其他运算符</a>: <code>a(...)</code>, <code>a,b</code>, <code>a?b:c</code> </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="default_comparisons.html" title="cpp/language/default comparisons">默认比较</a><span class="t-mark-rev t-since-cxx20">(C++20)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="operator_alternative.html" title="cpp/language/operator alternative">运算符的代用表示</a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="operator_precedence.html" title="cpp/language/operator precedence">优先级和结合性</a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="fold.html" title="cpp/language/fold">折叠表达式</a><span class="t-mark-rev t-since-cxx17">(C++17)</span></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="new.html" title="cpp/language/new">new 表达式</a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="delete.html" title="cpp/language/delete">delete 表达式</a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="throw.html" title="cpp/language/throw">throw 表达式</a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="alignof.html" title="cpp/language/alignof">alignof</a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="sizeof.html" title="cpp/language/sizeof">sizeof</a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="sizeof....html" title="cpp/language/sizeof...">sizeof...</a><span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
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<tr class="t-nv"><td colspan="5"> <a href="operators.html" title="cpp/language/operators">运算符重载</a></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 类型转换 </td></tr>
<tr class="t-nv"><td colspan="5"> <a href="implicit_cast.html" title="cpp/language/implicit conversion">隐式转换</a></td></tr>
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<tr class="t-nv"><td colspan="5"> <a href="explicit_cast.html" title="cpp/language/explicit cast">显式转换</a> <code>(T)a</code>, <code>T(a)</code></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="cast_operator.html" title="cpp/language/cast operator">用户定义转换</a></td></tr>
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<h3><span class="mw-headline" id=".E8.AF.AD.E6.B3.95">语法</span></h3>
<table class="t-sdsc-begin">

<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <code><b>"</b></code> (<span class="t-spar">未转义字符</span>|<span class="t-spar">转义字符</span>)* <code><b>"</b></code>
</td>
<td> (1)
</td>
<td class="t-sdsc-nopad">
</td></tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <code><b>L"</b></code> (<span class="t-spar">未转义字符</span>|<span class="t-spar">转义字符</span>)* <code><b>"</b></code>
</td>
<td> (2)
</td>
<td class="t-sdsc-nopad">
</td></tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <code><b>u8"</b></code> (<span class="t-spar">未转义字符</span>|<span class="t-spar">转义字符</span>)* <code><b>"</b></code>
</td>
<td> (3)
</td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span>
</td></tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <code><b>u"</b></code> (<span class="t-spar">未转义字符</span>|<span class="t-spar">转义字符</span>)* <code><b>"</b></code>
</td>
<td> (4)
</td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span>
</td></tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <code><b>U"</b></code> (<span class="t-spar">未转义字符</span>|<span class="t-spar">转义字符</span>)* <code><b>"</b></code>
</td>
<td> (5)
</td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span>
</td></tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <span class="t-spar">前缀</span><span class="t-mark">(可选)</span> <code><b>R"</b></code><span class="t-spar">分隔符</span><code><b>(</b></code> <span class="t-spar">原始字符</span> <code><b>)</b></code><span class="t-spar">分隔符</span><code><b>"</b></code>
</td>
<td> (6)
</td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span>
</td></tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr></table>
<h3><span class="mw-headline" id=".E8.A7.A3.E9.87.8A">解释</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  <span class="t-spar">未转义字符</span>
</td>
<td> -
</td>
<td> 任何合法字符，除了双引号 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"</span></span></span>、反斜杠 <span class="t-c"><span class="mw-geshi cpp source-cpp">\</span></span> 或换行符
</td></tr>
<tr class="t-par">
<td>  <span class="t-spar">转义字符</span>
</td>
<td> -
</td>
<td> 见<a href="escape.html" title="cpp/language/escape">转义序列</a>
</td></tr>
<tr class="t-par">
<td>  <span class="t-spar">前缀</span>
</td>
<td> -
</td>
<td> <code><b>L</b></code>、<code><b>u8</b></code>、<code><b>u</b></code>、<code><b>U</b></code> 之一
</td></tr>
<tr class="t-par">
<td>  <span class="t-spar">分隔符</span>
</td>
<td> -
</td>
<td> 除了括号、反斜杠和<a href="../string/byte/isspace.html" title="cpp/string/byte/isspace">空格</a>以外的任何源字符所构成的字符序列（可为空，长度至多 16 个字符）
</td></tr>
<tr class="t-par">
<td>  <span class="t-spar">原始字符</span>
</td>
<td> -
</td>
<td> 任何字符序列，但必须不含闭序列 <code><b>)</b></code><span class="t-spar">分隔符</span><code><b>"</b></code>
</td></tr></table>
<p><br>
</p>
<div class="t-li1"><span class="t-li">1)</span> 窄多字节字符串字面量。无前缀字符串字面量的类型是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw4">char</span><span class="br0">[</span>N<span class="br0">]</span></span></span>，其中 <code>N</code> 是以执行窄编码的编码单元计的字符串的大小，包含空终止符。</div>
<div class="t-li1"><span class="t-li">2)</span> 宽字符串字面量。<span class="t-c"><span class="mw-geshi cpp source-cpp">L<span class="st0">"..."</span></span></span> 字符串字面量的类型是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw4">wchar_t</span><span class="br0">[</span>N<span class="br0">]</span></span></span>，其中 <code>N</code> 是以执行宽编码的编码单元计的字符串的大小，包含空终止符。</div>
<div class="t-li1"><span class="t-li">3)</span> UTF-8 编码的字符串字面量。<span class="t-c"><span class="mw-geshi cpp source-cpp">u8<span class="st0">"..."</span></span></span> 字符串字面量的类型是 <span class="t-rev-inl t-until-cxx20"><span><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw4">char</span><span class="br0">[</span>N<span class="br0">]</span></span></span></span> <span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span></span><span class="t-rev-inl t-since-cxx20"><span><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> char8_t<span class="br0">[</span>N<span class="br0">]</span></span></span></span> <span><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></span></span>，其中 <code>N</code> 是以 UTF-8 编码单元计的字符串的大小，包含空终止符。</div>
<div class="t-li1"><span class="t-li">4)</span> UTF-16 编码的字符串字面量。<span class="t-c"><span class="mw-geshi cpp source-cpp">u<span class="st0">"..."</span></span></span> 字符串字面量的类型是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw4">char16_t</span><span class="br0">[</span>N<span class="br0">]</span></span></span>，其中 <code>N</code> 是以 UTF-16 编码单元计的字符串的大小，包含空终止符。</div>
<div class="t-li1"><span class="t-li">5)</span> UTF-32 编码的字符串字面量。<span class="t-c"><span class="mw-geshi cpp source-cpp">U<span class="st0">"..."</span></span></span> 字符串字面量的类型是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw4">char32_t</span><span class="br0">[</span>N<span class="br0">]</span></span></span>，其中 <code>N</code> 是以 UTF-32 编码单元计的字符串的大小，包含空终止符。</div>
<div class="t-li1"><span class="t-li">6)</span> 原始字符串字面量。用于避免转义任何字符。分隔符间的任何内容都成为字符串的一部分。若存在 <span class="t-spar">前缀</span> 则具有与上述相同的含义。</div>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
<p>字符串字面量始终要追加空字符（<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'<span class="es5">\0</span>'</span></span></span>、<span class="t-c"><span class="mw-geshi cpp source-cpp">L<span class="st0">'<span class="es5">\0</span>'</span></span></span>、<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char16_t</span><span class="br0">(</span><span class="br0">)</span></span></span> 等）：因此，字符串字面量 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"Hello"</span></span></span> 是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw4">char</span><span class="br0">[</span><span class="nu0">6</span><span class="br0">]</span></span></span>，并保有字符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'H'</span></span></span>、<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'e'</span></span></span>、<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'l'</span></span></span>、<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'l'</span></span></span>、<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'o'</span></span></span> 及 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'<span class="es5">\0</span>'</span></span></span>。
</p><p>窄多字节字符串字面量 <span class="t-v">(1)</span> 与宽字符串字面量 <span class="t-v">(2)</span> 的编码是实现定义的。例如，gcc 用<a rel="nofollow" class="external text" href="https://gcc.gnu.org/onlinedocs/cpp/Invocation.html">命令行选项</a> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">-</span>fexec<span class="sy2">-</span>charset</span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">-</span>fwide<span class="sy2">-</span>exec<span class="sy2">-</span>charset</span></span> 选择它们。
</p><p>在<a href="translation_phases.html" title="cpp/language/translation phases">翻译阶段 6</a>（预处理器之后）将毗邻的字符串字面量拼接起来。即 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"Hello,"</span>  <span class="st0">" world!"</span></span></span> 生成（单个）字符串 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"Hello, world!"</span></span></span>。若两个字符串带有同一编码前缀（或无一带有），则产生的字符串将拥有相同的编码前缀（或无前缀）。
</p>
 <table class="t-rev-begin">
<tr class="t-rev t-since-cxx11"><td>
<p>若一个字符串有编码前缀而另一个没有，则无编码前缀者被认为拥有与另一者相同的编码前缀。
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1">L<span class="st0">"Δx = %"</span> <a href="../types/integer.html"><span class="kw177">PRId16</span></a> <span class="co1">// 在阶段 4，PRId16 展开成 "d"</span>
                 <span class="co1">// 在阶段 6，L"Δx = %" 与 "d" 组成 L"Δx = %d"</span></pre></div></div>
<p>若 UTF-8 字符串字面量与宽字符串字面量毗邻，则程序非良构。
</p>
</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr>
</table>
<p>实现可能或可能不支持任何其他编码前缀组合。这种拼接的结果是实现定义的。
</p><p>字符串字面量拥有<a href="storage_duration.html" title="cpp/language/storage duration">静态存储期</a>，从而在程序生存期间存在于内存中。
</p><p>字符串字面量可用于<a href="aggregate_initialization.html" title="cpp/language/aggregate initialization">初始化字符数组</a>。若数组初始化类似 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span> str<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> <span class="st0">"foo"</span><span class="sy4">;</span></span></span>，则 <span class="t-c"><span class="mw-geshi cpp source-cpp">str</span></span> 将含有字符串 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"foo"</span></span></span> 的副本。
</p><p>允许<i>但不要求</i>编译器将相等或重叠的字符串字面量的存储合并起来。这意味着以指针比较时，相同的字符串字面量比较时可能或可能不相等。
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="kw4">bool</span> b <span class="sy1">=</span> <span class="st0">"bar"</span> <span class="sy1">==</span> <span class="nu0">3</span><span class="sy2">+</span><span class="st0">"foobar"</span> <span class="co1">// 可为 true 或 false，由实现定义</span></pre></div></div>
<p>试图修改字符串字面量导致<i>未定义行为</i>：它们可以存储于只读存储（例如 <code>.rodata</code>）或与其他字符串字面量合并：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> pc <span class="sy1">=</span> <span class="st0">"Hello"</span><span class="sy4">;</span>
<span class="kw4">char</span><span class="sy2">*</span> p <span class="sy1">=</span> <span class="kw1">const_cast</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy2">*</span><span class="sy1">&gt;</span><span class="br0">(</span>pc<span class="br0">)</span><span class="sy4">;</span>
p<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span> <span class="sy1">=</span> <span class="st0">'M'</span><span class="sy4">;</span> <span class="co1">// 未定义行为</span></pre></div></div>
<p>C 中，字符串字面量拥有类型 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span><span class="br0">[</span><span class="br0">]</span></span></span>，而且可以直接赋值给（非 const）<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span><span class="sy2">*</span></span></span>。C++03 也曾允许（但将其弃用，因为 C++ 中字面量是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span></span></span>）。C++11 不再允许不带转型的这种赋值。
</p><p>字符串字面量不需要是一个 C 字符串：若字符串字面量有内嵌的空字符，则它表示含有多于一条字符串的数组。
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> p <span class="sy1">=</span> <span class="st0">"abc<span class="es5">\0</span>def"</span><span class="sy4">;</span> <span class="co1">// std::strlen(p) == 3 ，但数组大小为 8</span></pre></div></div>
<p>若字符串字面量中一个合法十六进制数位跟随一个十六进制转译之后，则可能因非法转译序列而编译失败。字符串连接可用作替代方案：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co1">//const char* p = "\xfff"; // 错误：十六进制转义序列在范围外</span>
<span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> p <span class="sy1">=</span> <span class="st0">"<span class="es2">\xff</span>"</span><span class="st0">"f"</span><span class="sy4">;</span> <span class="co1">// OK ：此字面量是保有 {'\xff','f','\0'} 的 const char[3]</span></pre></div></div>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
 
<span class="kw4">char</span> array1<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> <span class="st0">"Foo"</span> <span class="st0">"bar"</span><span class="sy4">;</span>
<span class="co1">// 同</span>
<span class="kw4">char</span> array2<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> <span class="br0">{</span> <span class="st0">'F'</span>, <span class="st0">'o'</span>, <span class="st0">'o'</span>, <span class="st0">'b'</span>, <span class="st0">'a'</span>, <span class="st0">'r'</span>, <span class="st0">'<span class="es5">\0</span>'</span> <span class="br0">}</span><span class="sy4">;</span>
 
<span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> s1 <span class="sy1">=</span> R<span class="st0">"foo(
Hello
World
)foo"</span><span class="sy4">;</span>
<span class="co1">// 同</span>
<span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> s2 <span class="sy1">=</span> <span class="st0">"<span class="es1">\n</span>Hello<span class="es1">\n</span>World<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> array1 <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
    <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> array2 <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
 
    <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> s1<span class="sy4">;</span>
    <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> s2<span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Foobar
Foobar
 
Hello
World
 
Hello
World</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <a href="user_literal.html" title="cpp/language/user literal">用户定义字面量</a>
</td>
<td>  拥有用户定义后缀的字面量<span class="t-mark-rev t-since-cxx11">(C++11)</span> </td></tr>

</table>

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